A fully flexed spine inactivates back extensors, loads the posterior passive tissues (ligaments), and results in high shearing forces. In contrast, a neutral to slightly extended lumbar spine disables the interspinous ligaments and reduces joint shear. So, as you may have heard before, form matters.
Read the article Spine Mechanics for Lifters5 rounds for time of:
20 wall-ball shots
10 deadlifts
♀ 14-lb. ball, 155-lb. barbell
♂ 20-lb. ball, 225-lb. barbell
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